Oil pump structure for vehicle

Abstract

The invention provides an oil pump structure for a vehicle. The oil pump structure comprises a pump body, an outer rotor and an inner rotor. The pump body is provided with a rotor cavity. And an outer rotor and an inner rotor which are internally meshed are arranged in the rotor cavity. And the rotor cavity is sealed by the end cover. The outer rotor is provided with a plurality of radial holes. And the radial hole is positioned at a tooth groove in the middle of the tooth root of the outer rotor. And the radial hole penetrates through the gear thickness of the outer rotor. An oil outlet groove I and an oil outlet groove II are formed in the annular side wall of the rotor cavity. The oil outlet groove I is formed in the oil suction side. The oil outlet groove I improves oil charging efficiency and oil charging pressure, noise and cavitation are reduced, and the service life of the oil pump is prolonged. The oil outlet groove II reduces the pressure between teeth of the oil pump, keeps the pressure uniform, reduces pressure pulsation, reduces noise and prolongs the service life of the oil pump.

Description

Technical Field

[0001] The invention relates to the technical field of automobile oil pumps, and in particular to an oil pump structure for a vehicle. Background Art

[0002] Although gear-differential cycloidal rotor oil pumps are widely used in traditional fuel vehicles, hybrid vehicles and new energy pure electric vehicles, they also face challenges such as efficiency, noise and cavitation.

[0003] The existing gear-differential cycloidal rotor oil pump has relatively low filling efficiency and filling pressure, which will affect the performance of the oil pump. The gear-differential cycloidal rotor oil pump may generate noise during operation, which not only affects the driving experience but also causes noise pollution to the surrounding environment. This type of oil pump may experience cavitation, that is, bubbles form inside the pump, which burst under high pressure, which may cause damage to the pump and reduce efficiency.

[0004] Therefore, it is of great significance to develop a vehicle oil pump structure. Summary of the invention

[0005] The object of the present invention is to provide a vehicle oil pump structure to solve the problems existing in the prior art.

[0006] The technical solution adopted to achieve the purpose of the present invention is as follows: a vehicle oil pump structure includes a pump body, an outer rotor and an inner rotor.

[0007] The pump body includes an end cover and a pump body. The pump body has a rotor cavity. An outer rotor and an inner rotor meshing with each other are arranged in the rotor cavity. The inner rotor is an outer gear. The outer rotor is an inner gear. The meshing line of the outer rotor and the inner rotor separates the cavity of the rotor cavity into an oil suction side and an oil discharge side. The end cover closes the rotor cavity. An oil suction passage and an oil discharge passage are arranged on the end cover.

[0008] The outer rotor is provided with a plurality of radial holes, which are located at the middle tooth grooves of the tooth roots of the outer rotor, and which penetrate the thickness of the gears of the outer rotor.

[0009] The annular side wall of the rotor cavity is provided with an oil outlet groove I and an oil outlet groove II. The oil outlet groove I is arranged on the oil suction side. The oil outlet groove II is arranged on the oil discharge side. One end of the oil outlet groove I is connected to the oil suction channel, and the other end acts on the outer circle of the outer rotor. One end of the oil outlet groove II is connected to the oil discharge channel, and the other end acts on the outer circle of the outer rotor.

[0010] During the transmission process, the oil outlet groove I is connected with the radial hole at the corresponding position to form an oil suction channel, which is connected to the oil suction channel. The oil outlet groove II is connected with the radial hole at the corresponding position to form an oil discharge channel, which is connected to the oil discharge channel.

[0011] Furthermore, the inner rotor has Z teeth, and the outer rotor has Z+1 teeth.

[0012] Furthermore, the bottom of the rotor cavity is provided with an oil inlet groove and an oil outlet groove surrounding the shaft hole. The oil inlet groove and the oil outlet groove are both arc-shaped grooves. The oil outlet groove I surrounds the oil inlet groove on a plane. The oil outlet groove II surrounds the oil outlet groove on a plane.

[0013] Furthermore, a plurality of radial holes are arranged at equal intervals along the circumferential direction of the gear.

[0014] The technical effects of the present invention are unquestionable: the oil outlet groove I improves the oil filling efficiency, increases the oil filling pressure, reduces noise and cavitation, and increases the life of the oil pump. The oil outlet groove II reduces the pressure between the teeth of the oil pump, maintains uniform pressure, reduces pressure pulsation, reduces noise, and increases the life of the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the assembly structure of the pump body and the outer rotor;

[0016] Figure 2 It is a schematic diagram of the pump body;

[0017] Figure 3 Schematic diagram of the outer rotor.

[0018] In the figure: pump body 1, oil outlet groove I 101, oil suction channel 102, oil outlet groove II 103, oil discharge channel 104, rotor cavity 105, outer rotor 2, tooth root middle tooth groove 201, radial hole 202. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to the common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0020] Embodiment 1:

[0021] See also Figure 1 to Figure 3 , this embodiment provides a vehicle oil pump structure, including a pump body 1, an outer rotor 2 and an inner rotor.

[0022] The pump body 1 includes an end cover and a pump body. The pump body has a rotor cavity 105. The rotor cavity is provided with an outer rotor 2 and an inner rotor meshing with each other. The inner rotor is an outer gear. The outer rotor 2 is an inner gear. The meshing line between the outer rotor 2 and the inner rotor separates the cavity of the rotor cavity 105 into an oil suction side and an oil discharge side. The end cover closes the rotor cavity 105. The end cover is provided with an oil suction passage 102 and an oil discharge passage 104.

[0023] The outer rotor 2 is provided with a plurality of radial holes 202. The radial holes 202 are located at the positions of the middle tooth grooves 201 at the tooth roots of the outer rotor 2. The radial holes 202 penetrate the gear thickness of the outer rotor 2.

[0024] The annular side wall of the rotor cavity 105 is provided with an oil outlet groove I 101 and an oil outlet groove II 103. The oil outlet groove I 101 is arranged on the oil suction side. The oil outlet groove II 103 is arranged on the oil discharge side. One end of the oil outlet groove I 101 is connected to the oil suction passage 102, and the other end acts on the outer circle of the outer rotor 2. One end of the oil outlet groove II 103 is connected to the oil discharge passage 104, and the other end acts on the outer circle of the outer rotor 2.

[0025] During the transmission process, the oil outlet groove I 101 is connected with the radial hole 202 at the corresponding position to form an oil suction passage, which is connected to the oil suction passage 102. The oil outlet groove II 103 is connected with the radial hole 202 at the corresponding position to form an oil discharge passage, which is connected to the oil discharge passage 104.

[0026] Embodiment 2:

[0027] The main content of this embodiment is the same as that of embodiment 1, wherein the inner rotor has Z teeth. The outer rotor 2 has Z+1 teeth. The vehicle oil pump structure of this embodiment can be used for hybrid vehicle transmission, automobile automatic transmission oil pump and control pump or lubrication cooling oil pump structure of new energy vehicle.

[0028] Embodiment 3:

[0029] The main contents of this embodiment are the same as those of Embodiment 1 or 2, wherein the bottom of the rotor cavity 105 is provided with an oil inlet groove and an oil outlet groove surrounding the shaft hole. The oil inlet groove and the oil outlet groove are both arc-shaped grooves. The oil outlet groove I 101 surrounds the oil inlet groove on a plane. The oil outlet groove II 103 surrounds the oil outlet groove on a plane.

[0030] Embodiment 4:

[0031] The main content of this embodiment is the same as any one of Embodiments 1 to 3, wherein a plurality of radial holes 202 are arranged equidistantly along the circumferential direction of the gear.

Claims

1. A vehicle oil pump structure, characterized in that: It comprises a pump body (1), an outer rotor (2) and an inner rotor; The pump body (1) comprises an end cover and a pump body; the pump body has a rotor cavity (105); an outer rotor (2) and an inner rotor are arranged in the rotor cavity in meshing relationship; the inner rotor is an outer gear; the outer rotor (2) is an inner gear; the meshing line between the outer rotor (2) and the inner rotor separates the rotor cavity (105) into an oil suction side and an oil discharge side; the end cover seals the rotor cavity (105); an oil suction passage (102) and an oil discharge passage (104) are arranged on the end cover; The outer rotor (2) is provided with a plurality of radial holes (202); the radial holes (202) are located at the positions of the middle tooth grooves (201) at the tooth roots of the outer rotor (2); the radial holes (202) penetrate the thickness of the gears of the outer rotor (2); An oil outlet groove I (101) and an oil outlet groove II (103) are provided on the annular side wall of the rotor cavity (105); the oil outlet groove I (101) is arranged on the oil suction side; the oil outlet groove II (103) is arranged on the oil discharge side; one end of the oil outlet groove I (101) is connected to the oil suction passage (102), and the other end acts on the outer circle of the outer rotor (2); one end of the oil outlet groove II (103) is connected to the oil discharge passage (104), and the other end acts on the outer circle of the outer rotor (2); During the transmission process, the oil outlet groove I (101) is connected to the radial hole (202) at the corresponding position to form an oil suction channel, which is connected to the oil suction channel (102); the oil outlet groove II (103) is connected to the radial hole (202) at the corresponding position to form an oil discharge channel, which is connected to the oil discharge channel (104).

2. A vehicle oil pump structure according to claim 1, characterized in that: The inner rotor has Z teeth; the outer rotor (2) has Z+1 teeth.

3. A vehicle oil pump structure according to claim 1, characterized in that: The bottom of the rotor cavity (105) is provided with an oil inlet groove and an oil outlet groove surrounding the shaft hole; the oil inlet groove and the oil outlet groove are both arc-shaped grooves; the oil outlet groove I (101) surrounds the oil inlet groove on a plane; and the oil outlet groove II (103) surrounds the oil outlet groove on a plane.

4. A vehicle oil pump structure according to claim 1, characterized in that: A plurality of radial holes (202) are arranged at equal intervals along the circumferential direction of the gear.

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